Combination riveter



F. A. JIMERsoN CONBI'NATION RIVETER Jam 22 1924. 1,481,642

m n I Filed NOV. 1920 3 Sheets-Sheet l 'i e E e *E )JRR Ww Y fN/ f bf: E I V w l N N/ i w D l Q/ m* k. f7 @EN f Gl; i \V QR/s f i N NN, l f N w E? im @w u; m .'I ll 'y 1A f \b Q/ @a Q vmvElgfroR Jam@ 2z 1924.

1,481,642 YF. A. .nMERsoN CONBI NATION RIVETER Filed Nov. l2 1920 3 Sheets-Sheet 2 m mvg-:MOR

F. A. JIMERSON CONBINATION RIVETER Patented dem ldd runners n. rrnnnsolv,

oonranv, or

Ol' ATHENS, PENNSYLVANIA, ASSIGNOR T0 INGOLP-BAND CiY, N JERSEY, CORPORATION 0F NEW d'EY.

COMBINATION RIVETEB.

application filed November la, 1920. Steria] Iio. 423,588.

To aZZ whom it may ooowem:

Be it known that l, Financie A. JrnnnsoN a citizen of the United States, a resident oi Athens, county ot Bradford, State of Fenne Sylvania, have invented certain new and useul improvements in Combination Riveters, of which the following is a specification.,

This invention relates to pneumatic tools, but more particularly to a combination rivm eter, and holder-on, which may be used either as a riveter or as a holder-on without operating the piston of the hammer proper so that no Work in that case is done by the tool as a riveter.,

.'llhe primary object of the invention is to improve upon such combination tools and enable both the riveting hammer and the bodily movement of the riveting hammer in the casing of the tool to be controlled by a single throttle valve, .diderent positions vof which enable the machine to be used either es a riveter or as a holder-on.

ln order to eiiect such advantageouscontrol, the cylinder of the riveting hammer may be provided with a plunger head inthe casing of thev machine, and ports in the single throttle valve cooperate with passages in the casing for controlling both the supply and exhausto the machine, in such manner that the riveting hammer roper may be actuated outwardl in the casing without operating the piston li cylinder. v

A small suppl of motive duid, as live air may first be a`mitted behind the plunger head of the hammer cylinder without opening the main exhaust to the machine casing, and the hammer cylinder will be moved outward in the casin until the rivet set comes in contact with t e rivet, the outer casing being held from movement in any suitable manner as by means of a center at the back end of the casing. The hammer piston in the hammer cylinder will not operate however, until the throttle valve. has been turned to admit full supply to the hammer cylinder while at the same time opening the main exhaust through the outer casin Further objects of the invention-w51 here- 60 inafter appear and to all of these ends the invention consists of the features of construction, arrangement of parts and combinations of elements substantially as hereinater fully described and claimed in this dll ammer in the hammer specification and shown` in the accompanying drawings, in which Y `igure l is a longitudinal vertical sectional elevation of the machine showing the piston hammer of the riveter in one position, it bein understood however that the main thrott e valve is closed and the ma chine is not in operation.

Figure 2 is a horizontal sectional plan view of the outer casing and riveting hammer on the line 2 2 of Figure 3.

Figure 3 is a transverse sectional eleva'- tion partly broken away through the outer casing and. riveting hammer o'n the line 3--3 of Figure l looking in the direction of the arrows,

Figure 4' isa transverse detail sectional elevation taken through one portion of the throttle valve on the line lL-4 of Figure l looking in the direction of the arrows,

Figure 5 is a det-aill transverse sectional elevation taken through the exhaust end of the throttle valveon the line 5 5- of Figurt 1 looking in the direction of the arrows, an

Figures 6 and 7 are detail diagrammatic longitudinal sectional views of the riveting hammer with the ports and passages in the hammer cylinder in the same plane'to illustrate the valve action, and the piston hammer in two different positions.

Referrin to the drawings, the machine isprovided with a unitary casing A containing the riveting hammer proper, including the hammer cylinder B and piston ham` mer C and also containing a single main throttle valve C which controls both the inlet D and the main exhaust E of the machine. 'lhe hammer cylinder B is provided with a plunger head F of an suitable construction and the hammer cylinder and head F are bodily movable longltudinally With-in the cylinder casing G preferably formed asan integral part of the outer casing A. The cylinder casing G may be closed at the bach end by means of the plug H having the center d screwed therein for holding the casing stationary when the machine is used as a holder-on, and the front end of the cylinder casing G may be closed by suitable fmnt head portions K and L preferably having the packing 0 between said head portions.. The hammer cylinder B is adapted to receive the usual rivet set P. Suitable ports and passages, to be described, are provided in the hammer cylinder B, for the distribution of luid pressure behind and in front ot' the piston hammer C for actuating said hammer, said distribution being controlled by a suitable fluid actuated valve Q preferably a central type valve, as shown in this instance.

The casing A as shown is provided with the handle extensions R and S preferably at each end in which the throttle valve C is conveniently mounted preferably substantially parallel to the longitudinal axis of the casing. A supply passage T in `the extension R leads from the inlet D to a point in the cylinder casing G rearward of the plunger head F of the hammer cylinder and a main exhaust passage U in the extension S leads from the forward end ot the cylinder casing G to the valve C and communicates through the valve with the main exhaust E.

The throttle valve C comprises in this instance a hollow7 spindle V having a tapered plug W at one end seated in a valve seat formed by the sleeve X carried by the extension R and provided with the ports Y cooperating with the smaller port ay and the larger port in the valve plug lV. The other end of the valve spindle V as shown is provided with the exhaust port c cooperating with the port d in the bearing sleeve e carried by the extension S. An outer sleeve or cylindrical handle f is suitably secured to the valve spindle V between the tensions R and S as by means ot theset screw g so that the valve may bc conveniently rotated about its longitudinal axis by hand and a compression spring 71, within the end of the handle f bears against the washer 7C and normally forces the valve plutT W to its seat. A set'screw g in the valve C acts as a stop to limit the rotation. Lock nuts o on the reduced exhaust end of the valve spindle maybe so adjusted as to prevent the valve from jamming in its taper seat which avoids the diliiculty of jamming and hard operation which is apt to occur with ordinary taper valves. A suitable stop in the form of a spring pin gv seated in the extension S passes through the bearing sleeve e and is adapted to engage a notch or notches q in the valve spindle, in order to maintain the valve in any given position.

In the operation of the machine so far described, let it be assumed that in Figure l. the throttle valve is in closed position. ln starting the machine, rotation of the throttle valve and the tapered valve/plug W in the direction of the arrows 1' and s in Figures 4 and 5 will first bring the small port a into communication with the inlet D, thus admitting live air through the passage 'l behind the plungler head F of the riveting hammer, without owever opening the main exhaust E through the port c in the throttle valve. llnder this condition, the plunger F and the riveting hammer will be forced bodily outward in the cylinder easing G, thus permitting the machine to be operated as a holderon. Further rotation of the throttle valve in the same direction will place the large port o in the tapered plufr "iV in communication with the inlet D and at. the same time the exhaust port c at the opposite end ot the throttle valve, will be placed in communication with the main exhaust passage U, permitting the exhaust pressure from the riveting hammer cylinder to escape from the cylinder casing G through the main exhaust E in which case the riveting' hammer begins to operate as a riveter, because until the main exhaust E was opened, the exhaust pressure from the riveting hammer could not escape and the hammer piston C could not operate.

vThe operation ot the fluid actuated valve Q in the riveting hammer can best be cxplained by. reference. to the diagrammatic views ot Figures 6 and 7. The back end ot the riveting hammer cylinder B may be closed by means or' the cap 2 having the ports and 4- communicating with the space in the cylinder casing G behind the plunger head l supplied with fluid pressure from the passage T.

ln Figure 6 the piston hammer C is shown at. the rear end of' its stroke in position to be driven forwardly and the valve Q. in its forward position for starting. Motive liuid is admitted through the. port 3 in the cap Q and the port 5 in the cylinder B behind the piston hammer C. and as the piston is driven torwardly. and uncovers the timing port 6, live air is admitted through said port. passage T and port to the annular groove 9 leading to a point beneath the. shoulder l() ot the valve Q. which forms a rearwardly artin;r pressure area.

lVheu the piston (l in its forward travel next uncovers the exhaust port ll. pressure behind the pistou is partially relieved since the pressure may exhaust out through port l2 to the space between the hammer cylinder B and the outer casing, which communicates with the main exhaust. By partially relieving the pressure behind the piston C in the rearward portion ot the cylinder the valve Q is thrown out of the balance, because pressure is thus relieved from the projected forwardly acting pressure areas of the valve, lending` to hold the valve in forward position. These forwardly acting pressure areas are constituted by the rearward rim of the valve and the inner shoulders 'formed by the stepped portion of the valve body` which may together be termed projected areas. The live pressure constantly on the rearward shoulder 18 of the valve through ports 4, 14C, and l5 then preponderates and operates atene to throw the valve rearwardly to the position indica-ted in Figure 7. The valve 1s lthrown rearwardly inmediately after the As the piston delivers its blow on the rivet set, live air passes through the port 15, around the annular groove 16 in the valve and throu h the port 17, passage 18 and port 19 at the orward end of the cylinder and in front of the piston. rlhe live air port 15 is relatively small sothat a full force of the blow is imparted to the rivet set or working tool. The piston is then ready for the rearward stroke, and provision is made for suffcient travel beyond' the exhaust port 11 as indicated in Figure` 7 to permit the air to be fully exhausted behind the piston.

With the valve in the position indicated in Figure-7, the piston, 1n traveling rearwardly on the return stroke first covers the exhaust port 11, and the air from behind the piston escapes through port 6, passage 7, port 8, groove 9, and under the shoulder 10 to the port 21 and through the passage 22 to the exhaust port 12, thus reventing pres` sure from accumulating be ind the piston. When 'the timing port 6 is closed by the piston on its return stroke, pressure gradually builds up behind the piston due to compression of entrapped air, until the pressure acting on the forwardly operating projected areas of the valve Q is sufficient to overcome the pressure constantl 4 on the rearwardly actin shoulder 13, which at this time is less than ine pressure, due to throttling or wire drawing es the motive duid dows through the small port 15. Live air pressure is also provided by this construction to cushion the piston on its rearward stroke..

The function of the smallport 23 in the valve Q beneath the shoulder 13 is to admit live air to shirt the valve and start the operation et the machine when the piston and valve are both at the extreme rearward position, as orinstance when the machine is idle and pointing in an upward direction.

l claim:

1. A combination riveter and holder-on, comprising a casing having handle extensions at each end, a iluid operated riveting hammer bodily movable in said casing, a single throttle valve mounted in sind. handle extensions for control-ling both the operation of the hammer and the bodily movement ofthe hammer inthe said casin and a sleeve forming handle for actuating the said valve, whereby the machine may be used either as a holder-on or as a riveter.

Q 'A combination riveter and holder-on, comprising a casing having handle extensions at each end, a duid operated riveting hammer bodily movable in said casing,

ports and passages inthe handle extensions leading to and from the casing and the hammer for the distribution of motive fluid to 'the machine, a single throttle valve mounted in said handle extensions for controlling both the operation of the hammer and the bodily movement of the hammer in the casing and a sleeve forming a handle for actuatmg said valve, whereby the hammer may bev actuated outward in the casing to ac t as a holder-on without operating the hammer for riveting.

3. A combination riveter and holder-on, comprising a casing having handlev extensions at each end, a fluid operated riveting hammer including'a cylinder and a piston hammer reciprocating therein, said cylinder bein movable in sa1d casing and actuated by uid pressure, a single throttle valve mounted in said handle extensions for controlling both the operation of the hammer and the movement of the hammer cylinder in the casing, a sleeve forming a handle for actuating said valve and ports in the valve cooperating with passages in the handle extensions leading to the casing whereby the hammer cylinder ma be actuated outward in the casing to utilize the machine as a holder-on wlthout operating the piston hammer in the cylinder.

t. A combination riveter and holder-on, comprising a casing having handle extensions at each vend, a tluid operated riveting hammer including a cylinder and a piston hammer reciprocating therein, said cylinder having a head and being movable in said casing by Huid pressure, passages in the handle extensions for supplying and exhausting motive duid to and -from said casing and said cylinder, a single throttle valve mounted in said handle extensions for controlling both the said supply and 'exhaust passages and a sleeve forming a handle for actuating said valve, whereby the herinner cylinder may be actuated outward in the casing to utilize the machine as a holder-on without operating the piston hammer. in the cylinder. v

5. A combination riveter and holder-on, comprising a casing having handle extensions at each end, a Huid operated` riveting hammer bodily movable in said Casin an a single throttle valve mounted longitudinally in seid handle extensions, substantially parallel to the axis ot the casing, thereby forming a handle and also controlling both the operation of the hammer and the bodily movement of the hammer in the said casing, whereby the machine may be used either as a holder-on or as a riveter..

6. A combination riveter and holder-on, comprising a casing having handle extensions at' each end, a duid operated rivetin ,www bodily movable in said casing, and

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a .single throttle valve mounted longitudinally in said handle extensions substantially parallel to the axis of the casing, thereby forming a handle and also being rotatable about its own longitudinal axis forcontrolling both the operation of the hammer and the bodily movement of the hammer in the said easing, whereby the machine may be used either as a holder-on or a riveter.

7. A combination riveter and holder-on comprising a casing having handle eXtensions integral therewith at each end, a fluid operated riveting hammer bodily movable marga-aa in said easing, a single throttle valve in said handle extensions substantially parallel to the axis of the casing, said valve comprising a hollow spindle, a sleeve forming a handle secured to the valve for rotating the valve and controlling both the operation of the hammer and the bodily movement of the hammer in the said casing, whereby the machine may be used either as a holder-on or a riveter. f

ln testimony whereof I have signed this specification.

FRANCIS A. JIMERSON. 

